Section Vii: Gas Connections - Bradford White UCG100H199 Installation & Operation Manual

The gas supply lines must meet all requirements of the National Fuel Gas Code (ANSI Z223.1-Latest Edition), or in
Canada CAN/CGA B149.1 Natural Gas Installation Code (Latest Edition) or CAN/CGA B 149.2 Propane Installation Code
(Latest Edition).
The maximum permissible gas supply pressure is fourteen (14.0) inches (3.5 kPa) water column for natural and propane
gas.
1. Connect this water heater only to the type of gas as shown on the rating plate. Use clean black iron pipe or
equivalent material approved by local codes and ordinances. (Dirt and scale from the pipe can enter the gas valve
and cause it to malfunction). The inlet gas line must have a minimum length of three (3) inches (7.6 cm) drip leg
(sediment trap) installed as close to the water heater's gas valve as possible. A ground joint union must be installed
as close to the water heater as possible in the gas supply line feeding the water heater to permit servicing of the
water heater. Compounds used on the threaded joints of the gas piping must be resistant to the action of liquefied
petroleum gases/propane gas. DO NOT apply pipe dope to the gas valve inlet and make certain that no pipe dope
has become lodged in the inlet screen of the gas valve. Extreme care must be taken to ensure no pipe dope enters
the gas valve. Avoid excessive torque when tightening the gas supply line to the gas valve. Excessive torque may
result in cracking of the gas valve housing and could create a gas leak. The suggested maximum torque is 31.5 ft.
lbs. (4.4 kg-m).
The manufacturer of this water heater will not be liable for any damage or injury caused as a result of a cracked gas
inlet as a result of excessive torque.
2. This water heater and its gas connection must be leak tested before placing the water heater in operation. Check for
gas leaks with a soap and water solution and a brush or a commercial leak detector fluid. NEVER USE A MATCH OR
OPEN FLAME FOR TESTING!
The water heater and individual shutoff valve must be disconnected from the gas supply piping system during any
pressure testing of the system at test pressures in excess of 1/2 psi (3.5 kPa). The water heater must be isolated from
the gas supply piping system by closing its manual shutoff valve during any pressure testing of the gas supply system
at test pressures equal to or less than 1/2 psi (3.5 kPa). The supply line must be capped when not connected to the
water heater.
3. While checking for leaks care must be taken to prevent solution from contacting the electrical connections at the
control. If electrical connections at the control become wet, they must be thoroughly dried before attempting to
operate the water heater.
GAS METER SIZE – NATURAL GASES ONLY
Be sure that the gas meter has sufficient capacity to supply the full rated gas input of the water heater as well as the
requirements of all other gas fired equipment supplied by the meter. If the gas meter is too small, ask the gas company to
install a larger meter having adequate capacity.
If copper supply lines are used, they must be internally tinned and certified for gas service.
GAS PRESSURE REGULATION
Main line gas pressure to the water heater should be between a maximum 14.0 inch W.C. and a minimum supply
pressure as shown on the rating plate.
installations, a regulator sized for the input rating of the water heater will need to be installed just ahead of the inlet gas
connection to the water heater to reduce excess gas pressure or surges in gas pressure.
BEFORE PLACING THE WATER HEATER IN OPERATION, CHECK FOR GAS LEAKAGE. USE SOAP AND WATER
SOLUTION OR OTHER MATERIAL ACCEPTABLE FOR THE PURPOSE OF LOCATING GAS LEAKS.

SECTION VII: GAS CONNECTIONS

WARNING
CAUTION
The inlet gas pressure must not exceed the maximum value.
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